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A003305 Figure 8's with 2n edges on the square lattice.
(Formerly M1860)
0
2, 8, 40, 208, 1120, 6200, 35236 (list; graph; refs; listen; history; internal format)
OFFSET

4,1

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

S. G. Whittington and J. P. Valleau, Figure eights on the square lattice: enumeration and Monte Carlo estimation, J. Phys. A 3 (1970), 21-27.

CROSSREFS

Sequence in context: A027617 A187071 A154626 * A076625 A139415 A119817

Adjacent sequences:  A003302 A003303 A003304 * A003306 A003307 A003308

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 11:46 EST 2012. Contains 206011 sequences.